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anv: reduce BT emissions & surface state writes with push descriptors

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Zink on Anv running Gfxbench gl_driver2 is significantly slower than
Iris.

The reason is simple, whereas Iris implements uniform updates using
push constants and only has to emit 3DSTATE_CONSTANT_* packets, Zink
uses push descriptors with a uniform buffer, which on our
implementation use both push constants & binding tables.

Anv ends up doing the following for each uniform update :
   - allocate 2 surface states :
      - one for the uniform buffer as the offset specify by zink
      - one for the descriptor set buffer
   - pack the 2 RENDER_SURFACE_STATE
   - re-emit binding tables
   - re-emit push constants

Of all of those operations, only the last one ends up being useful in
this benchmark because all the uniforms have been promoted to push
constants.

This change defers the 3 first operations at draw time and executes
them only if the pipeline needs them.

Vkoverhead before / after :
  descriptor_template_1ubo_push:                      40670 / 85786
  descriptor_template_12ubo_push:                      4050 / 13820
  descriptor_template_1combined_sampler_push,         34410 / 34043
  descriptor_template_16combined_sampler_push,         2746 / 2711
  descriptor_template_1sampled_image_push,            34765 / 34089
  descriptor_template_16sampled_image_push,            2794 / 2649
  descriptor_template_1texelbuffer_push,             108537 / 111342
  descriptor_template_16texelbuffer_push,             20619 / 20166
  descriptor_template_1ssbo_push,                     41506 / 85976
  descriptor_template_8ssbo_push,                      6036 / 18703
  descriptor_template_1image_push,                    88932 / 89610
  descriptor_template_16image_push,                   20937 / 20959
  descriptor_template_1imagebuffer_push,             108407 / 113240
  descriptor_template_16imagebuffer_push,             32661 / 34651

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19050>
This commit is contained in:
Lionel Landwerlin
2022-10-02 19:24:40 +03:00
committed by Marge Bot
parent ff91c5ca42
commit b49b18f0b7
4 changed files with 121 additions and 51 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
src/intel/vulkan/anv_private.h
View File

@@ -1795,6 +1795,14 @@ struct anv_descriptor_set {
*/
uint32_t size;
/* Is this descriptor set a push descriptor */
bool is_push;
/* Bitfield of descriptors for which we need to generate surface states.
* Only valid for push descriptors
*/
uint32_t generate_surface_states;
/* State relative to anv_descriptor_pool::bo */
struct anv_state desc_mem;
/* Surface state for the descriptor buffer */
@@ -1908,7 +1916,6 @@ anv_descriptor_set_write_buffer_view(struct anv_device *device,
void
anv_descriptor_set_write_buffer(struct anv_device *device,
struct anv_descriptor_set *set,
struct anv_state_stream *alloc_stream,
VkDescriptorType type,
struct anv_buffer *buffer,
uint32_t binding,
@@ -1916,6 +1923,11 @@ anv_descriptor_set_write_buffer(struct anv_device *device,
VkDeviceSize offset,
VkDeviceSize range);
void
anv_descriptor_write_surface_state(struct anv_device *device,
struct anv_descriptor *desc,
struct anv_state surface_state);
void
anv_descriptor_set_write_acceleration_structure(struct anv_device *device,
struct anv_descriptor_set *set,
@@ -1934,7 +1946,6 @@ anv_descriptor_set_write_inline_uniform_data(struct anv_device *device,
void
anv_descriptor_set_write_template(struct anv_device *device,
struct anv_descriptor_set *set,
struct anv_state_stream *alloc_stream,
const struct vk_descriptor_update_template *template,
const void *data);
@@ -2545,6 +2556,7 @@ struct anv_cmd_state {
enum anv_pipe_bits pending_pipe_bits;
VkShaderStageFlags descriptors_dirty;
VkShaderStageFlags push_descriptors_dirty;
VkShaderStageFlags push_constants_dirty;
struct anv_vertex_binding vertex_bindings[MAX_VBS];